Drum Brake Friction Lining Composition for Shape Conformity
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Solution Overview
Problem
Existing drum brake friction linings face challenges in achieving optimal friction properties and stable flowability to conform to the crescent shape of the brake drum while avoiding manufacturing difficulties and long molding times, often requiring adhesives or intermediate layers for attachment to the lining carrier plate.
Innovation Solution
A friction lining mixture comprising at least 15 wt.% metal fibers (preferably steel fibers), 7 wt.% glass fibers in bundles, 4 wt.% resin, and 2 wt.% friction grains with Mohs hardness ≥ 9, which can be directly pressed onto the lining carrier plate without adhesives or intermediate layers, utilizing glass fiber bundles for flowability and abrasive grains for shape conformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If glass fiber bundles and high resin content are used to improve flowability and shape conformity, then the friction lining can assume the required crescent shape, but manufacturing difficulties and long molding times occur
Solution Approach 1:
The patent changes the physical-chemical parameters of the friction lining compound by incorporating specific additives (metallic tin, friction particles) and adjusting the resin content to optimize both flowability and molding speed, resolving the contradiction between shape conformity and manufacturing efficiency
Solution Approach 2:
The patent creates a composite material system combining glass fiber bundles, resin, metallic tin, and friction particles, where each component contributes specific properties that collectively achieve both good flowability for shape conformity and reduced molding time through optimized material interactions
2Shape
If phyllosilicates and flake graphite are added to improve flowability, then the friction lining can conform to the brake drum surface, but manufacturing difficulties and long molding times result
Solution Approach 1:
The patent extracts or removes problematic components (phyllosilicates and flake graphite) that cause manufacturing difficulties while maintaining their beneficial flowability effects through alternative materials like glass fiber bundles and metallic tin, thereby simplifying the manufacturing process
Solution Approach 2:
The patent replaces difficult-to-process materials (phyllosilicates and flake graphite) with more easily manufactured alternatives (glass fiber bundles, metallic tin, friction particles) that achieve the same functional goals with simpler processing requirements
3Reliability
If steel wool and flake graphite are used to improve friction properties, then the friction performance increases, but the lining requires adhesives or intermediate layers for attachment
Solution Approach 1:
The patent merges the friction-enhancing functions of steel wool and flake graphite into a unified compound system where metallic tin and friction particles work synergistically with glass fiber bundles and resin to provide both high friction performance and direct adhesion to the lining carrier plate, eliminating the need for separate adhesive layers
Solution Approach 2:
The patent creates a multi-functional friction lining compound where the same material composition simultaneously provides friction enhancement, adhesion to the carrier plate, and flowability for shape conformity, replacing the need for separate functional layers and simplifying the overall structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures stable adherence to the brake drum surface with friction coefficients of 0.3 to 0.5, eliminating the need for adhesives and reducing manufacturing complexity, while maintaining high friction performance and durability.
Implementation Method 1
the friction lining should preferably be able to be pressed directly onto the lining carrier plate without adhesive and without an intermediate layer... sufficient to improved flowability so that the resulting friction lining assumes the required sickle shape stably and without cracks
Implementation Method 2
2 wt.% friction grains with Mohs hardness ≥ 9... friction coefficients of 0.3 to 0.5... maintaining high friction performance
Implementation Method 3
Both types contain steel wool or steel fibers and/or metal fibers, such as copper or zinc fibers, for reinforcement (increasing the internal strength of a friction lining)
Implementation Method 4
4 wt.% resin... The connection of the friction lining to the lining carrier plate is preferably achieved by the friction materials themselves
Data Source
Figure 1~2
AI summary
The invention relates to a friction lining mixture for producing a brake lining for drum brakes comprising at least 15 wt.% metal fibers, preferably steel fibers, in particular steel wool, at least 7 wt.% glass fibers, in the form of glass fiber bundles, at least 4 wt.% resin and at least 2 wt.% friction grains, preferably with a Mohs hardness of equal to or greater than 9, as well as a friction lining and drum brake lining produced therefrom and a method for producing a drum brake lining.